TY - JOUR
T1 - Enhanced mechanical properties of Zr65Cu15Ni10Al10bulk metallic glass by simultaneously introducing surface grooves and multiple shear bands
AU - Yuan, Xudong
AU - Zhang, Zequn
AU - Gao, Qingwei
AU - Zhou, Li
AU - Song, Kaikai
AU - Zou, Xiaoyu
AU - Şopu, Daniel
AU - Hu, Lina
AU - Sun, Baoan
AU - Eckert, Jürgen
N1 - Publisher Copyright: © 2022 The Author(s).
PY - 2022/10/4
Y1 - 2022/10/4
N2 - Recent investigations have demonstrated that the plasticity of bulk metallic glasses (BMGs) at room temperature can be improved by artificially introducing both macroscopic and microscopic defects. In this work, both surface grooves and multiple shear bands (MLSBs) are concurrently introduced into the surface of a Zr65Cu15Ni10Al10 BMG employing an ultrasonic bonding machine, whose sizes are also tailored by tuning gas pressures and times. After surface treatment, MLSBs appear around grooves due to the pre-plastic deformation, while numerous nano-scale crystals resulting from thermal-induced nanocrystallization appear within the grooves, leading to the emergence of hierarchical structural heterogeneities. As a result, the strength and plasticity are effectively enhanced compared to as-cast samples when suitable experimental parameters are adopted. The plastic deformation mechanisms change from single main shear banding to multiple shear banding. Therefore, the serrated plastic behaviors exhibit a transition from chaotic to self-organized critical dynamics after surface treatment, confirming the modification of the shear banding instability. The present study provides a viable method to tailor the mechanical properties of BMGs and sheds light on their dynamic plastic deformation behaviors.
AB - Recent investigations have demonstrated that the plasticity of bulk metallic glasses (BMGs) at room temperature can be improved by artificially introducing both macroscopic and microscopic defects. In this work, both surface grooves and multiple shear bands (MLSBs) are concurrently introduced into the surface of a Zr65Cu15Ni10Al10 BMG employing an ultrasonic bonding machine, whose sizes are also tailored by tuning gas pressures and times. After surface treatment, MLSBs appear around grooves due to the pre-plastic deformation, while numerous nano-scale crystals resulting from thermal-induced nanocrystallization appear within the grooves, leading to the emergence of hierarchical structural heterogeneities. As a result, the strength and plasticity are effectively enhanced compared to as-cast samples when suitable experimental parameters are adopted. The plastic deformation mechanisms change from single main shear banding to multiple shear banding. Therefore, the serrated plastic behaviors exhibit a transition from chaotic to self-organized critical dynamics after surface treatment, confirming the modification of the shear banding instability. The present study provides a viable method to tailor the mechanical properties of BMGs and sheds light on their dynamic plastic deformation behaviors.
KW - Bulk metallic glasses
KW - Mechanical properties
KW - Nanocrystallization
KW - Shear bands
KW - Surface treatment
UR - http://www.scopus.com/inward/record.url?scp=85144821897&partnerID=8YFLogxK
U2 - 10.1016/j.jmrt.2022.09.117
DO - 10.1016/j.jmrt.2022.09.117
M3 - Article
AN - SCOPUS:85144821897
SN - 2238-7854
VL - 21.2022
SP - 1490
EP - 1506
JO - Journal of Materials Research and Technology
JF - Journal of Materials Research and Technology
IS - November-December
ER -